3 files changed, 33 insertions, 11 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index bb89fe727bb1..9cf85721d83c 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2671,14 +2671,20 @@ static blkcnt_t ext4_inode_blocks(struct ext4_inode *raw_inode,
                                         struct ext4_inode_info *ei)
 {
         blkcnt_t i_blocks ;
-        struct super_block *sb = ei->vfs_inode.i_sb;
+        struct inode *inode = &(ei->vfs_inode);
+        struct super_block *sb = inode->i_sb;
 
         if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
                                 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
                 /* we are using combined 48 bit field */
                 i_blocks = ((u64)le16_to_cpu(raw_inode->i_blocks_high)) << 32 |
                                         le32_to_cpu(raw_inode->i_blocks_lo);
-                return i_blocks;
+                if (ei->i_flags & EXT4_HUGE_FILE_FL) {
+                        /* i_blocks represent file system block size */
+                        return i_blocks  << (inode->i_blkbits - 9);
+                } else {
+                        return i_blocks;
+                }
         } else {
                 return le32_to_cpu(raw_inode->i_blocks_lo);
         }
@@ -2829,8 +2835,9 @@ static int ext4_inode_blocks_set(handle_t *handle,
                  * i_blocks can be represnted in a 32 bit variable
                  * as multiple of 512 bytes
                  */
-                raw_inode->i_blocks_lo   = cpu_to_le32((u32)i_blocks);
+                raw_inode->i_blocks_lo   = cpu_to_le32(i_blocks);
                 raw_inode->i_blocks_high = 0;
+                ei->i_flags &= ~EXT4_HUGE_FILE_FL;
         } else if (i_blocks <= 0xffffffffffffULL) {
                 /*
                  * i_blocks can be represented in a 48 bit variable
@@ -2841,12 +2848,23 @@ static int ext4_inode_blocks_set(handle_t *handle,
                 if (err)
                         goto  err_out;
                 /* i_block is stored in the split  48 bit fields */
-                raw_inode->i_blocks_lo   = cpu_to_le32((u32)i_blocks);
+                raw_inode->i_blocks_lo   = cpu_to_le32(i_blocks);
                 raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32);
+                ei->i_flags &= ~EXT4_HUGE_FILE_FL;
         } else {
-                ext4_error(sb, __FUNCTION__,
-                                "Wrong inode i_blocks count  %llu\n",
-                                (unsigned long long)inode->i_blocks);
+                /*
+                 * i_blocks should be represented in a 48 bit variable
+                 * as multiple of  file system block size
+                 */
+                err = ext4_update_rocompat_feature(handle, sb,
+                                            EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
+                if (err)
+                        goto  err_out;
+                ei->i_flags |= EXT4_HUGE_FILE_FL;
+                /* i_block is stored in file system block size */
+                i_blocks = i_blocks >> (inode->i_blkbits - 9);
+                raw_inode->i_blocks_lo   = cpu_to_le32(i_blocks);
+                raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32);
         }
 err_out:
         return err;
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 2b9dc96ec43e..64067de70c6f 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1631,11 +1631,14 @@ static loff_t ext4_max_size(int bits)
                 upper_limit >>= (bits - 9);
 
         } else {
-                /* We use 48 bit ext4_inode i_blocks */
+                /*
+                 * We use 48 bit ext4_inode i_blocks
+                 * With EXT4_HUGE_FILE_FL set the i_blocks
+                 * represent total number of blocks in
+                 * file system block size
+                 */
                 upper_limit = (1LL << 48) - 1;
 
-                /* total blocks in file system block size */
-                upper_limit >>= (bits - 9);
         }
 
         /* indirect blocks */
diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h
index be25eca9c040..6ae91f40aaa2 100644
--- a/include/linux/ext4_fs.h
+++ b/include/linux/ext4_fs.h
@@ -178,8 +178,9 @@ struct ext4_group_desc
 #define EXT4_NOTAIL_FL                  0x00008000 /* file tail should not be merged */
 #define EXT4_DIRSYNC_FL                 0x00010000 /* dirsync behaviour (directories only) */
 #define EXT4_TOPDIR_FL                  0x00020000 /* Top of directory hierarchies*/
-#define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
+#define EXT4_HUGE_FILE_FL               0x00040000 /* Set to each huge file */
 #define EXT4_EXTENTS_FL                 0x00080000 /* Inode uses extents */
+#define EXT4_RESERVED_FL                0x80000000 /* reserved for ext4 lib */
 
 #define EXT4_FL_USER_VISIBLE            0x000BDFFF /* User visible flags */
 #define EXT4_FL_USER_MODIFIABLE         0x000380FF /* User modifiable flags */